07. ACR-105 UNIT 14 PRACTICE TEST

In both the heating and cooling function, a thermostat is functioning on a ________.

• drop in pressure

• drop in temperature

• rise in temperature

• rise in pressure

  
  

A low-voltage thermostat normally regulates other controls and does not carry much current, typically around 10 amps or less.

• True

• False

To get a more accurate reading when using a bulb-type thermometer on a flat surface, _________.

• the thermometer should be kept in a vertical position

• the bulb should be immersed in liquid first

  
  

• the thermometer should be kept in a horizontal position.

• insulation should be place over the bulb

  
  

Most hermetic compressors are cooled by ________.

• passing air over the motor

• suction gas passing through the motor

• water running over the compressor shell

  
  

• using a timed off-cycle to allow the motor cool

The term fluid applies to both the liquid and vapor states of matter.

• True

• False

The pressure at which a pressure control will interrupt an electrical circuit is called the _________.

• cut-in

  
  

• differential

• switch pressure

• cut-out

In the HVAC/R field, both temperature and pressure controls incorporate cut-out, cut-in, and differential adjustments.

• True

• False

A device that measures pressure and then converts the sensed pressure into an electronic signal is a(n) __________.

• digital thermometer

• high pressure control

  
  

• low pressure control

  
  

• pressure transducer

  
  

A(n) __________ is used to ensure that the compressor has oil pressure when operating.

• low pressure control

• high pressure control

  
  

• oil pressure safety control

• snap-disc oil control

Electromechanical controls convert a mechanical movement into some type of heat energy.

• True

• False